New [Sensors]: Added new "hybrid" sensors (experimental). These new sensors replace the respective WMI sensors. For better performance, they try to use Windows "Performance Counters" to query data from the target system and use WMI only as fallback.You can preselect the usage of WMI or performance counters in the device settings.

New: Hyper-V Virtual Storage Device BETA

New: Windows Pagefile BETA

New: Windows System Uptime BETA

Offer an alternative to WMI monitoring (can ease the load on the WMI system for installations with many WMI sensors)

Sensors use RPC for communications (less overhead than WMI) and require the "Remote Registry Service" to be enabled on the target systems, this is usually the case for Windows server products, but not for workstations.

Bugfix [Webinterface]: Main menu did not show all available items for large configurations (limitations still apply within the "Devices | Group View" sub menu; please navigate through the device tree instead to see all available groups)

Bugfix [Webinterface]: Fixed an 'Operation not allowed on sorted List' error which occured in special cases

Tree version update: The configuration file of this version is not downwards compatible with previous PRTG versions.

Many other bugfixes and improvements to the core, web interface, and cluster

October 16th 2012 - Version 12.4.4.3098/3099 [Stable]

Bugfix: [Sensors] Fixed a memory/handle leak in http sensors

September 30th 2012 - Version 12.3.4.3048/3049 [Stable]

New: [Core]: Language Brazilian Portuguese

New [Sensors]: Added Sensors for NetApp SANs

New: SNMP NetApp Disk Free Sensor

New: SNMP NetApp System Health Sensor

New: SNMP NetApp I/O Sensor

New: SNMP NetApp Network Interface

New [Sensors]: Added Sensor Family „Performance Counters" BETA (experimental). Please give us feedback on these sensors!

New: Performance Counter CPU Sensor

New: Performance Counter Memory

Offers an alternative to WMI monitoring (can ease the load for installations with many WMI sensors)

Sensors use RPC for communications (less overhead than WMI) and require the "Remote Registry Service" to be enabled on the target systems, this is usually the case for Windows server products, but not for workstations.

New [Sensors]: Added sensors for monitoring Dell server hardware

New: SNMP Dell PowerEdge Physical Disk Sensor

New: SNMP Dell PowerEdge System Health Sensor

Improved [Core]: PRTG web server can now run on https (SSL) on a user specific port (other than 443)

Improved [Sensors]: In the XML returned by EXE/Script (Advanced) sensors you can now specify the encoding

Improved [Sensors]: WMI Service sensor can now write results to disk (for debugging)

Improved [Autodiscovery]: Optimized discovery of SNMP RMON sensors

Changed [Core]: Internet Explorer 10 (Windows 8/2012) can now be used to access the PRTG Ajax web interface

Changed [Sensors]: SSH Port settings has been moved to the device settings (and can be overridden in the sensor settings, if necessary)

Bugfix [Sensors]: IP on DNS Blacklist sensor rejected DNS zones like zen.spamhaus.org and did not show a warning in case it found an IP on a blacklist

Bugfix [Reports]: Dropdown list could show empty lines in some cases

Bugfix [Cluster]: Schedules did not work on all failover clusters

Bugfix [Core]: Saving device templates did not work in some cases

More than 100 other bugfixes and improvements as well as an updated manual

August 27th 2012 - Version 12.3.3.2854/2855 [Stable]

New [Cluster]: Users can now select which cluster nodes are used to monitor a specific group/device (e.g. when not all cluster nodes can connect to a subnet or VPN)

New [Sensors]: MS Exchange Transport Queue Sensor

New [Sensors]: Added a third option to the HTTP Full Page sensors. With this new third option you can enable screenshotting of each sensor run. You can either save only the latest screenshot, or each screenshot of this sensor. The image files will be stored on the probe system (user can set the number of days until the files are purged, creates a lot of data on the disk). This option needs plenty of CPU cycles and should not be used too heavily.

New [WebGUI]: Added an experimental feature that allows a user inside the WebGUI to install a remote probe on a Windows device in the sensor tree (Context menu of devices, device tools, install remote probe). The remote probe is automatically installed and configured. Afterwards it will show up at the bottom of the sensor tree and the user must approve the probe. Then sensors can be set up as usual. This is a great way to circumvent WMI or other connectivity problems by running sensors directly on the device.

Improved [Core]: When Active Directory integration is used all requests to the AD servers are now cached for one hour. Before this caching was implemented large and/or slow AD environments could potentially slow down PRTG’s user interfaces. If a password is changed in the AD you must either wait for 1h or clear the cache manually (on the status page).

Improved [Graphs]: Graphs now display the applied averaging interval at the bottom right

Improved [Sensors]: When devices need extensive time to answer WMI requests the sensor will be labeled “sluggish” because these sensors can actually affect the performance of the complete WMI system for all devices. We recommend to either install a probe directly on these devices or at least move these sensors to a dedicated probe

Changed [Sensors]: The Windows Scheduled Task sensor now supports tasks in sub folders. Note: When monitoring target systems which run Windows 2003 or Windows XP, the sensor might stop working under certain conditions.

July 29th 2012 - Version 12.3.1.2419/2420 [Stable]

New [Sensors]: WMI HDD Health sensor (supports local and remote SMART monitoring via WMI). Note: The old HDD Health sensor is now deprecated. It was based on local API access to SMART technology and was only available on probe devices

New [Sensors]: SSH Script sensor (allows you to run a custom script on a Mac OS X/Linux/Solaris system and send back results as sensor values)

Improved [Webserver]: Map refresh for public maps doesn't blank the screen upon reload

Improved [Sensors]: IMAP sensor now displays the number of emails in the mailbox as a channel

Various minor improvements for the WebGUI, Core Server, Enterprise Console, and manual

July 19th 2012 - Version 12.3.1.2365/2366 [Stable]

Bugfix: Added a workaround for a browser bug that was introduced with Firefox 14.0.1 yesterday (FF14 currently can not display curved texts in PRTG's sunburst views of the device tree)

Bugfix: In the "SNMP Compatibility Options", the "Overflow Values" option did not work as expected (functionality was reversed). We corrected this. From now on, "Ignore overflow values" will actually ignore overflow values, whereas "Handle overflow values as valid results" will show the (possibly incorrect) value reported by the device. We apologize for the inconvenience caused by this bug! For more details, please see our knowledge base article.

Note:We recommend using SNMP v2 if supported by your devices, in order to generally avoid 32bit counter overflows altogether. In the "Credentials for SNMP Devices" section of the PRTG device representing your switch or router, set the SNMP Version to "v2c". Then, please add your SNMP sensors anew. Existing sensors will continue to use the former SNMP version setting. Historic data cannot be transferred to the new sensors, but you can pause the old sensors to keep their data.

June 28th 2012 - Version 12.2.2.2210/2211 [Stable]

Bugfix: During an update from V9 to V12 custom SSL certificates of the web server were not migrated properly (only if autoupdate was used)

Updated manual

June 20th 2012 - Version 12.2.2.2156/2157 [Stable]

Workaround [Sensors]: Some users experienced elevated WMI delays and gray sensors throughout their installations. After intensive investigation we found that new functionality inside the WMI Service sensor caused these effects - but only in very few situations/networks. The new features are now disabled by default and we recommend all users to upgrade to version 12.2.2. We will further investigate the root cause.

New: VMware Host Server Health Sensor monitors the health of a VMware host server via SOAP. It will show an overview of your host servers' states, just as known from the vCenter console ("green" / "warning" / "error").

New: SIP Options Ping Sensor (monitors whether a SIP server (e.g. VoIP telephony system) will accept a call and will be able to forward it to the next hop); the sensor will show an error if the device does not accept calls or if the device is not able to route calls)

Rewrite: Xen Virtual Machine Sensor. Monitors CPU, memory, and network usage, as well as other vital system parameters of Xen virtual machines.

Rewrite: SMTP Sensor now automatically supports TLS

Improved Active Directory Integration (among others PRTG will now get the email address of new users from the active directory, when the AD integration is used)

Improved: IMAP Sensor can now be used to monitor backup processes and other scheduled processes by looking for specific emails (e.g. by topic) in a mailbox and checking that the most recent email is not older than x days

Improved: SSH sensors now support Solaris 9 and 10

Discontinued: old VMware Host sensors must be manually replaced with new versions

Discontinued: old XEN server sensors must be manually replaced with new versions

Enterprise Console

Improved: Now covers about 90% of WebGUI functionality

Other changes

Improved web server security

PRTG now handles all strings internally as UTF-8 (including web server and emails), this means that you can now mix different languages, charsets and single-byte as well as double-byte strings inside one installation

Tree version update: The configuration file of this version is not downwards compatible with previous PRTG versions.